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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Impaired loans, unpaid principal balance	$ 2,462	$ 7,137	$ 2,602
Impaired loans, recorded investment with no allowance	2,130	996	795
Impaired loans, recorded investment with allowance	0	5,818	1,509
Impaired loans, total recorded investment	2,130	6,814	2,304
Impaired loans, related allowance	0	2,188	55
Impaired loans, average recorded investment	2,252	6,704	4,517
Impaired loans, interest income recognized	1	1	9
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	743	556	889
Impaired loans, recorded investment with no allowance	618	430	765
Impaired loans, recorded investment with allowance	0	0	0
Impaired loans, total recorded investment	618	430	765
Impaired loans, related allowance	0	0	0
Impaired loans, average recorded investment	732	440	429
Impaired loans, interest income recognized	1	0	9
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance		323	0
Impaired loans, recorded investment with no allowance		269	0
Impaired loans, recorded investment with allowance		0	0
Impaired loans, total recorded investment		269	0
Impaired loans, related allowance		0	0
Impaired loans, average recorded investment		273	91
Impaired loans, interest income recognized		0	0
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	39	4,619	40
Impaired loans, recorded investment with no allowance	28	297	30
Impaired loans, recorded investment with allowance	0	4,270	0
Impaired loans, total recorded investment	28	4,567	30
Impaired loans, related allowance	0	2,065	0
Impaired loans, average recorded investment	29	4,443	2,384
Impaired loans, interest income recognized	0	1	0
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance	1,680	1,639	1,673
Impaired loans, recorded investment with no allowance	1,484	0	0
Impaired loans, recorded investment with allowance	0	1,548	1,509
Impaired loans, total recorded investment	1,484	1,548	1,509
Impaired loans, related allowance	0	123	55
Impaired loans, average recorded investment	1,491	1,548	1,613
Impaired loans, interest income recognized	$ 0	$ 0	$ 0

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-Section 50
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